diff --git a/api_authentication.go b/api_authentication.go
index 0dfe17a..b139b68 100644
--- a/api_authentication.go
+++ b/api_authentication.go
@@ -76,7 +76,11 @@ func (a *AuthenticationAPIService) AuthToken(ctx context.Context) ApiAuthTokenRe
 	}
 }
 
-func (r ApiAuthTokenRequest) AuthToken() (*OAuth, *http.Response, error) {
+func (r ApiAuthTokenRequest) GetAuthToken(clientId string, clientSecret string) (*OAuth, *http.Response, error) {
+	r.clientId = new(string)
+	*r.clientId = clientId
+	r.clientSecret = new(string)
+	*r.clientSecret = clientSecret
 	return r.Execute()
 }
 
diff --git a/api_authentication_test.go b/api_authentication_test.go
index cfb0c2f..e0d1973 100644
--- a/api_authentication_test.go
+++ b/api_authentication_test.go
@@ -26,10 +26,8 @@ func Test_TelstraMessaging_AuthenticationAPIService(t *testing.T) {
 		clientSecret := "YOUR CLIENT SECRET"
 
 		authApi := apiClient.AuthenticationAPI.AuthToken(context.Background())
-		authApi.clientId = &clientId
-		authApi.clientSecret = &clientSecret
 
-		oauthResult, resp, err := authApi.AuthToken()
+		oauthResult, resp, err := authApi.GetAuthToken(clientId, clientSecret)
 
 		if err != nil {
 			fmt.Println("Error:", err)
diff --git a/api_params.go b/api_params.go
index 16713c5..6b70d69 100644
--- a/api_params.go
+++ b/api_params.go
@@ -31,10 +31,7 @@ func SetRequestParams() *RequestParams {
 
 func GetAuthorization(apiClient *APIClient, clientId string, clientSecret string) (string, error) {
 	authApi := apiClient.AuthenticationAPI.AuthToken(context.Background())
-	authApi.clientId = &clientId
-	authApi.clientSecret = &clientSecret
-
-	oauthResult, _, err := authApi.AuthToken()
+	oauthResult, _, err := authApi.GetAuthToken(clientId, clientSecret)
 	if err != nil {
 		return "", err
 	}